OTPServer Class

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The OTPServer class checks the validity of one-time passwords.

Syntax

class secureblackbox.OTPServer

Remarks

A One-Time Password (OTP) is a password that is valid for only one session or transaction. OTPs were designed to overcome the weaknesses of traditional static passwords such as vulnerability to replay attacks. The OTPServer class can check the validity of HMAC-Based One-Time Passwords (HOTP) and Time-Based One-Time Passwords (TOTP).

Property List

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The following is the full list of the properties of the class with short descriptions. Click on the links for further details.

Method List

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The following is the full list of the methods of the class with short descriptions. Click on the links for further details.

Event List

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The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.

Config Settings

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The following is a list of config settings for the class with short descriptions. Click on the links for further details.

base_time Property

Specifies the TOTP client's base time.

Syntax

def get_base_time() -> str: ...
def set_base_time(value: str) -> None: ...

base_time = property(get_base_time, set_base_time)

Default Value

""

Remarks

Specifies the TOTP (Time-based OTP, RFC 6238) server's base time parameter.

delta Property

Specifies the resynchronization limit.

Syntax

def get_delta() -> int: ...
def set_delta(value: int) -> None: ...

delta = property(get_delta, set_delta)

Default Value

0

Remarks

This property is used to overcome the asynchronicity between the one-time password (OTP) client and server. For HOTP servers (HMAC-based OTP, RFC 4226), Delta defines the maximum possible deviation of the client's counter value. For TOTP servers (Time-based OTP, RFC 6238), Delta contains the maximum number of time steps the client can be out of synch.

fips_mode Property

Reserved.

Syntax

def get_fips_mode() -> bool: ...
def set_fips_mode(value: bool) -> None: ...

fips_mode = property(get_fips_mode, set_fips_mode)

Default Value

FALSE

Remarks

This property is reserved for future use.

user_count Property

The number of records in the User arrays.

Syntax

def get_user_count() -> int: ...
def set_user_count(value: int) -> None: ...

user_count = property(get_user_count, set_user_count)

Default Value

0

Remarks

This property controls the size of the following arrays:

• user_associated_data
• user_base_path
• user_certificate
• user_data
• user_email
• user_handle
• user_hash_algorithm
• user_incoming_speed_limit
• user_otp_algorithm
• user_otp_len
• user_otp_value
• user_outgoing_speed_limit
• user_password
• user_shared_secret
• user_ssh_key
• user_username

The array indices start at 0 and end at user_count - 1.

user_associated_data Property

Contains the user's Associated Data when SSH AEAD (Authenticated Encryption with Associated Data) algorithm is used.

Syntax

def get_user_associated_data(user_index: int) -> bytes: ...
def set_user_associated_data(user_index: int, value: bytes) -> None: ...

Remarks

Contains the user's Associated Data when SSH AEAD (Authenticated Encryption with Associated Data) algorithm is used.

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_base_path Property

Base path for this user in the server's file system.

Syntax

def get_user_base_path(user_index: int) -> str: ...
def set_user_base_path(user_index: int, value: str) -> None: ...

Default Value

""

Remarks

Base path for this user in the server's file system.

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_certificate Property

Contains the user's certificate.

Syntax

def get_user_certificate(user_index: int) -> bytes: ...
def set_user_certificate(user_index: int, value: bytes) -> None: ...

Remarks

Contains the user's certificate.

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_data Property

Contains uninterpreted user-defined data that should be associated with the user account, such as comments or custom settings.

Syntax

def get_user_data(user_index: int) -> str: ...
def set_user_data(user_index: int, value: str) -> None: ...

Default Value

""

Remarks

Contains uninterpreted user-defined data that should be associated with the user account, such as comments or custom settings.

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_email Property

The user's email address.

Syntax

def get_user_email(user_index: int) -> str: ...
def set_user_email(user_index: int, value: str) -> None: ...

Default Value

""

Remarks

The user's email address.

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_handle Property

Allows to get or set a 'handle', a unique identifier of the underlying property object.

Syntax

def get_user_handle(user_index: int) -> int: ...
def set_user_handle(user_index: int, value: int) -> None: ...

Default Value

0

Remarks

Allows to get or set a 'handle', a unique identifier of the underlying property object. Use this property to assign objects of the same type in a quicker manner, without copying them fieldwise.

When you pass a handle of one object to another, the source object is copied to the destination rather than assigned. It is safe to get rid of the original object after such operation. pdfSigner.setSigningCertHandle(certMgr.getCertHandle());

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_hash_algorithm Property

Specifies the hash algorithm used to generate TOTP (Time-based One-Time Passwords) passwords for this user.

Syntax

def get_user_hash_algorithm(user_index: int) -> str: ...
def set_user_hash_algorithm(user_index: int, value: str) -> None: ...

Default Value

""

Remarks

Specifies the hash algorithm used to generate TOTP (Time-based One-Time Passwords) passwords for this user. Three HMAC algorithms are supported, with SHA-1, SHA-256, and SHA-512 digests:

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_incoming_speed_limit Property

Specifies the incoming speed limit for this user.

Syntax

def get_user_incoming_speed_limit(user_index: int) -> int: ...
def set_user_incoming_speed_limit(user_index: int, value: int) -> None: ...

Default Value

0

Remarks

Specifies the incoming speed limit for this user. The value of 0 (zero) means "no limitation".

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_otp_algorithm Property

The algorithm used to generate one-time passwords (OTP) for this user, either HOTP (Hash-based OTP) or TOTP (Time-based OTP).

Syntax

def get_user_otp_algorithm(user_index: int) -> int: ...
def set_user_otp_algorithm(user_index: int, value: int) -> None: ...

Default Value

0

Remarks

The algorithm used to generate one-time passwords (OTP) for this user, either HOTP (Hash-based OTP) or TOTP (Time-based OTP). In the former case, a value of a dedicated counter is used to generate a unique password, while in the latter the password is generated on the basis of the current time value.

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_otp_len Property

Specifies the length of the user's OTP password.

Syntax

def get_user_otp_len(user_index: int) -> int: ...
def set_user_otp_len(user_index: int, value: int) -> None: ...

Default Value

0

Remarks

Specifies the length of the user's OTP password.

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_otp_value Property

The user's time interval (TOTP) or Counter (HOTP).

Syntax

def get_user_otp_value(user_index: int) -> int: ...
def set_user_otp_value(user_index: int, value: int) -> None: ...

Default Value

0

Remarks

The user's time interval (TOTP) or Counter (HOTP).

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_outgoing_speed_limit Property

Specifies the outgoing speed limit for this user.

Syntax

def get_user_outgoing_speed_limit(user_index: int) -> int: ...
def set_user_outgoing_speed_limit(user_index: int, value: int) -> None: ...

Default Value

0

Remarks

Specifies the outgoing speed limit for this user. The value of 0 (zero) means "no limitation".

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_password Property

The user's authentication password.

Syntax

def get_user_password(user_index: int) -> str: ...
def set_user_password(user_index: int, value: str) -> None: ...

Default Value

""

Remarks

The user's authentication password.

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_shared_secret Property

Contains the user's secret key, which is essentially a shared secret between the client and server.

Syntax

def get_user_shared_secret(user_index: int) -> bytes: ...
def set_user_shared_secret(user_index: int, value: bytes) -> None: ...

Remarks

Contains the user's secret key, which is essentially a shared secret between the client and server.

Shared secrets can be used in TLS-driven protocols, as well as in OTP (where it is called a 'key secret') for generating one-time passwords on one side, and validate them on the other.

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_ssh_key Property

Contains the user's SSH key.

Syntax

def get_user_ssh_key(user_index: int) -> bytes: ...
def set_user_ssh_key(user_index: int, value: bytes) -> None: ...

Remarks

Contains the user's SSH key.

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

user_username Property

The registered name (login) of the user.

Syntax

def get_user_username(user_index: int) -> str: ...
def set_user_username(user_index: int, value: str) -> None: ...

Default Value

""

Remarks

The registered name (login) of the user.

The user_index parameter specifies the index of the item in the array. The size of the array is controlled by the user_count property.

config Method

Sets or retrieves a configuration setting.

Syntax

def config(configuration_string: str) -> str: ...

Remarks

config is a generic method available in every class. It is used to set and retrieve configuration settings for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

do_action Method

Performs an additional action.

Syntax

def do_action(action_id: str, action_params: str) -> str: ...

Remarks

do_action is a generic method available in every class. It is used to perform an additional action introduced after the product major release. The list of actions is not fixed, and may be flexibly extended over time.

The unique identifier (case insensitive) of the action is provided in the ActionID parameter.

ActionParams contains the value of a single parameter, or a list of multiple parameters for the action in the form of PARAM1=VALUE1;PARAM2=VALUE2;....

Common ActionIDs:

is_hotp_password_valid Method

Validates a hash-based one-time password.

Syntax

def is_hotp_password_valid(key_secret: bytes, password_length: int, counter: int, password: str) -> bool: ...

Remarks

Use this method to validate a hash-based one-time password (HOTP) by using explicit HOTP parameters. For this method to work, no user details need to be provided in users collection.

is_password_valid Method

Validates an OTP password for a user.

Syntax

def is_password_valid(username: str, password: str) -> bool: ...

Remarks

Use this method to check a one-time Password for a user specified by UserID. The known users' details need to be provided in users list.

is_totp_password_valid Method

Validates a time-based one-time password.

Syntax

def is_totp_password_valid(key_secret: bytes, password_length: int, time_interval: int, hash_algorithm: str, password: str) -> bool: ...

Remarks

Use this method to validate a time-based one-time password (TOTP) by using explicit TOTP parameters. For this method to work, no user details need to be provided in users collection.

Supported hash algorithms:

reset Method

Resets the class settings.

Syntax

def reset() -> None: ...

Remarks

reset is a generic method available in every class.

on_error Event

Information about errors during one-time password (OTP) processing.

Syntax

class OTPServerErrorEventParams(object):
  @property
  def error_code() -> int: ...

  @property
  def description() -> str: ...

# In class OTPServer:
@property
def on_error() -> Callable[[OTPServerErrorEventParams], None]: ...
@on_error.setter
def on_error(event_hook: Callable[[OTPServerErrorEventParams], None]) -> None: ...

Remarks

This event is fired in case of exceptional conditions during OTP checks.

ErrorCode contains an error code and Description contains a textual description of the error.

on_notification Event

This event notifies the application about an underlying control flow event.

Syntax

class OTPServerNotificationEventParams(object):
  @property
  def event_id() -> str: ...

  @property
  def event_param() -> str: ...

# In class OTPServer:
@property
def on_notification() -> Callable[[OTPServerNotificationEventParams], None]: ...
@on_notification.setter
def on_notification(event_hook: Callable[[OTPServerNotificationEventParams], None]) -> None: ...

Remarks

The class fires this event to let the application know about some event, occurrence, or milestone in the class. For example, it may fire to report completion of the document processing. The list of events being reported is not fixed, and may be flexibly extended over time.

The unique identifier of the event is provided in the EventID parameter. EventParam contains any parameters accompanying the occurrence. Depending on the type of the class, the exact action it is performing, or the document being processed, one or both may be omitted.

OTPServer Config Settings

The class accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the config method.

Base Config Settings

OTPServer Errors

OTPServer Errors